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f6c63835 KH |
1 | /* |
2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> | |
3 | * Copyright (c) 2009 by Krzysztof Helt | |
4 | * Routines for control of MPU-401 in UART mode | |
5 | * | |
6 | * MPU-401 supports UART mode which is not capable generate transmit | |
7 | * interrupts thus output is done via polling. Also, if irq < 0, then | |
8 | * input is done also via polling. Do not expect good performance. | |
9 | * | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
24 | * | |
25 | */ | |
26 | ||
27 | #include <linux/io.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
f6c63835 KH |
29 | #include <linux/delay.h> |
30 | #include <linux/ioport.h> | |
31 | #include <linux/errno.h> | |
d81a6d71 | 32 | #include <linux/export.h> |
f6c63835 KH |
33 | #include <sound/core.h> |
34 | #include <sound/rawmidi.h> | |
35 | ||
36 | #include "msnd.h" | |
37 | ||
38 | #define MSNDMIDI_MODE_BIT_INPUT 0 | |
39 | #define MSNDMIDI_MODE_BIT_OUTPUT 1 | |
40 | #define MSNDMIDI_MODE_BIT_INPUT_TRIGGER 2 | |
41 | #define MSNDMIDI_MODE_BIT_OUTPUT_TRIGGER 3 | |
42 | ||
43 | struct snd_msndmidi { | |
44 | struct snd_msnd *dev; | |
45 | ||
46 | unsigned long mode; /* MSNDMIDI_MODE_XXXX */ | |
47 | ||
48 | struct snd_rawmidi_substream *substream_input; | |
49 | ||
50 | spinlock_t input_lock; | |
51 | }; | |
52 | ||
53 | /* | |
54 | * input/output open/close - protected by open_mutex in rawmidi.c | |
55 | */ | |
56 | static int snd_msndmidi_input_open(struct snd_rawmidi_substream *substream) | |
57 | { | |
58 | struct snd_msndmidi *mpu; | |
59 | ||
60 | snd_printdd("snd_msndmidi_input_open()\n"); | |
61 | ||
62 | mpu = substream->rmidi->private_data; | |
63 | ||
64 | mpu->substream_input = substream; | |
65 | ||
66 | snd_msnd_enable_irq(mpu->dev); | |
67 | ||
68 | snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_START); | |
69 | set_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode); | |
70 | return 0; | |
71 | } | |
72 | ||
73 | static int snd_msndmidi_input_close(struct snd_rawmidi_substream *substream) | |
74 | { | |
75 | struct snd_msndmidi *mpu; | |
76 | ||
77 | mpu = substream->rmidi->private_data; | |
78 | snd_msnd_send_dsp_cmd(mpu->dev, HDEX_MIDI_IN_STOP); | |
79 | clear_bit(MSNDMIDI_MODE_BIT_INPUT, &mpu->mode); | |
80 | mpu->substream_input = NULL; | |
81 | snd_msnd_disable_irq(mpu->dev); | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static void snd_msndmidi_input_drop(struct snd_msndmidi *mpu) | |
86 | { | |
87 | u16 tail; | |
88 | ||
89 | tail = readw(mpu->dev->MIDQ + JQS_wTail); | |
90 | writew(tail, mpu->dev->MIDQ + JQS_wHead); | |
91 | } | |
92 | ||
93 | /* | |
94 | * trigger input | |
95 | */ | |
96 | static void snd_msndmidi_input_trigger(struct snd_rawmidi_substream *substream, | |
97 | int up) | |
98 | { | |
99 | unsigned long flags; | |
100 | struct snd_msndmidi *mpu; | |
101 | ||
102 | snd_printdd("snd_msndmidi_input_trigger(, %i)\n", up); | |
103 | ||
104 | mpu = substream->rmidi->private_data; | |
105 | spin_lock_irqsave(&mpu->input_lock, flags); | |
106 | if (up) { | |
107 | if (!test_and_set_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, | |
108 | &mpu->mode)) | |
109 | snd_msndmidi_input_drop(mpu); | |
110 | } else { | |
111 | clear_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode); | |
112 | } | |
113 | spin_unlock_irqrestore(&mpu->input_lock, flags); | |
114 | if (up) | |
115 | snd_msndmidi_input_read(mpu); | |
116 | } | |
117 | ||
118 | void snd_msndmidi_input_read(void *mpuv) | |
119 | { | |
120 | unsigned long flags; | |
121 | struct snd_msndmidi *mpu = mpuv; | |
ab647a2d | 122 | void __iomem *pwMIDQData = mpu->dev->mappedbase + MIDQ_DATA_BUFF; |
20e2b791 | 123 | u16 head, tail, size; |
f6c63835 KH |
124 | |
125 | spin_lock_irqsave(&mpu->input_lock, flags); | |
20e2b791 TI |
126 | head = readw(mpu->dev->MIDQ + JQS_wHead); |
127 | tail = readw(mpu->dev->MIDQ + JQS_wTail); | |
128 | size = readw(mpu->dev->MIDQ + JQS_wSize); | |
129 | if (head > size || tail > size) | |
130 | goto out; | |
131 | while (head != tail) { | |
132 | unsigned char val = readw(pwMIDQData + 2 * head); | |
133 | ||
134 | if (test_bit(MSNDMIDI_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) | |
135 | snd_rawmidi_receive(mpu->substream_input, &val, 1); | |
136 | if (++head > size) | |
137 | head = 0; | |
138 | writew(head, mpu->dev->MIDQ + JQS_wHead); | |
f6c63835 | 139 | } |
20e2b791 | 140 | out: |
f6c63835 KH |
141 | spin_unlock_irqrestore(&mpu->input_lock, flags); |
142 | } | |
143 | EXPORT_SYMBOL(snd_msndmidi_input_read); | |
144 | ||
9021b2b8 | 145 | static const struct snd_rawmidi_ops snd_msndmidi_input = { |
f6c63835 KH |
146 | .open = snd_msndmidi_input_open, |
147 | .close = snd_msndmidi_input_close, | |
148 | .trigger = snd_msndmidi_input_trigger, | |
149 | }; | |
150 | ||
151 | static void snd_msndmidi_free(struct snd_rawmidi *rmidi) | |
152 | { | |
153 | struct snd_msndmidi *mpu = rmidi->private_data; | |
154 | kfree(mpu); | |
155 | } | |
156 | ||
157 | int snd_msndmidi_new(struct snd_card *card, int device) | |
158 | { | |
159 | struct snd_msnd *chip = card->private_data; | |
160 | struct snd_msndmidi *mpu; | |
161 | struct snd_rawmidi *rmidi; | |
162 | int err; | |
163 | ||
164 | err = snd_rawmidi_new(card, "MSND-MIDI", device, 1, 1, &rmidi); | |
165 | if (err < 0) | |
166 | return err; | |
ef86f581 | 167 | mpu = kzalloc(sizeof(*mpu), GFP_KERNEL); |
f6c63835 KH |
168 | if (mpu == NULL) { |
169 | snd_device_free(card, rmidi); | |
170 | return -ENOMEM; | |
171 | } | |
172 | mpu->dev = chip; | |
173 | chip->msndmidi_mpu = mpu; | |
174 | rmidi->private_data = mpu; | |
175 | rmidi->private_free = snd_msndmidi_free; | |
176 | spin_lock_init(&mpu->input_lock); | |
177 | strcpy(rmidi->name, "MSND MIDI"); | |
178 | snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, | |
179 | &snd_msndmidi_input); | |
180 | rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; | |
181 | return 0; | |
182 | } |